Abstract
Solid-state 7Li and 13C MAS NMR spectra of cycled graphitic Li-ion anodes demonstrate SEI compound formation upon lithiation that is followed by changes in the SEI upon delithiation. Solid-state 13C DPMAS NMR shows changes in peaks associated with organic solvent compounds (ethylene carbonate and dimethyl carbonate, EC/DMC) upon electrochemical cycling due to the formation of and subsequent changes in the SEI compounds. Solid-state 13C NMR spin-lattice (T1) relaxation time measurements of lithiated Li-ion anodes and reference poly(ethylene oxide) (PEO) powders, along with MALDI-TOF mass spectrometry results, indicate that large-molecular-weight polymers are formed in the SEI layers of the discharged anodes. MALDI-TOF MS and NMR spectroscopy results additionally indicate that delithiated anodes exhibit a larger number of SEI products than is found in lithiated anodes.
Original language | English (US) |
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Pages (from-to) | 371-380 |
Number of pages | 10 |
Journal | ACS Applied Materials and Interfaces |
Volume | 8 |
Issue number | 1 |
DOIs | |
State | Published - Jan 13 2016 |
Keywords
- Li-ion battery
- MALDI TOF MS
- NMR
- SEI
- graphite anode
ASJC Scopus subject areas
- General Materials Science